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Analog Devices Inc./Maxim Integrated MAX692AC/D
- Part No.:
- MAX692AC/D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX692AC/D.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
MAX692AC/D from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer, and power-fail detection for +5V systems. It asserts an active-low RESET pulse (200ms width) when VCC drops below 4.40V, switches VOUT to VBATT during brownout, monitors PFI against a 1.25V reference, and triggers reset if WDI remains static for 1.6s - used in battery-powered controllers and critical μP monitoring.
For engineers reviewing the MAX692AC/D datasheet, MAX692AC/D pinout, MAX692AC/D application, or MAX692AC/D equivalent, this page delivers verified functional identity, exact reset threshold (4.40V), guaranteed RESET assertion down to VCC = 1V, battery-switch hysteresis (40mV), and confirmed compatibility with MAX692A pinout - all essential for reliable power-monitoring design validation.
Technical Context
The MAX692AC/D implements a fixed-threshold reset generator with internal 4.40V comparator, 200ms reset timeout timer, and independent 1.6s watchdog timer cleared by WDI edges. Its battery switchover uses dual PMOS switches (5Ω for VCC→VOUT, 80Ω for VBATT→VOUT) with 20mV switching thresholds and 40mV hysteresis.
It integrates a 1.25V precision reference for the PFI comparator, guarantees PFO response within 400ns, and maintains RESET low until VCC rises 200ms above 4.40V. In backup mode (VCC < 4.40V and VBATT > VCC), quiescent current drops to 50nA while supporting up to 250μA VOUT load at VBATT − 0.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - ensures reliable μP reset initiation before +5V rail collapse in industrial-grade systems |
| Reset Pulse Width | 200ms (min 140ms, max 280ms) - meets minimum reset hold time requirements for 80C51, Z80, and similar μPs |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic firmware hang detection without external timing components |
| Battery-Switch Hysteresis | 40mV - prevents oscillatory VOUT switching during slow VCC droop near 4.40V |
| Quiescent Current (VCC active) | 200–350µA - enables long-term operation from primary supply without excessive loading |
| Backup Mode Current | 50nA typical (≤1µA over temp) - preserves lithium battery life for multi-year RAM retention |
| PFI Comparator Accuracy | ±2% (guaranteed) - supports precise power-fail warning at system-level voltage margins |
Pinout & Package
Dice form factor: bare die, unmounted, intended for hybrid or custom module integration. No leadframe or molded package; substrate must remain unconnected per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | CMOS RAM supply output | Switches between VCC (via 5Ω PMOS) and VBATT (via 80Ω PMOS) based on reset threshold crossing |
| VCC | +5V main supply input | Primary power source; powers internal circuitry and asserts RESET when falling below 4.40V |
| GND | Ground reference | Common return for all analog and digital functions; substrate must be left unconnected |
| PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V reference |
| PFO | Power-fail open-drain output | Signals impending supply failure to μP interrupt line; 400ns response time, 3.2mA sink capability |
| WDI | Watchdog timer input | Edge-triggered; resets internal 1.6s timer on rising/falling transitions; floating disables watchdog |
| RESET | Active-low reset output | Guaranteed logic low down to VCC = 1V; pulses low for 200ms on power-up, brownout, or watchdog timeout |
| VBATT | Backup battery input | Supplies VOUT only when VCC < 4.40V and VBATT > VCC + 20mV; draws <1µA in deep backup |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures valid reset signal even during severe brownout, preventing μP runaway before full power collapse |
| 40mV battery switchover hysteresis | Eliminates chattering during marginal VCC conditions, protecting RAM data integrity during slow power decay |
| ±2% power-fail comparator accuracy | Enables accurate early-warning detection of +5V regulator dropout without calibration or trimming |
| 50nA backup-mode quiescent current | Supports >10-year lithium battery life for nonvolatile RAM retention in unpowered standby states |
| Internal 1.25V precision reference | Provides stable PFI comparison point independent of VCC variation, enabling robust undervoltage sensing |
Applications
| Battery-Powered Controllers | Critical μP Power Monitoring |
|---|---|
Use Scenario: Portable data loggers powered by coin-cell batteries require uninterrupted RAM retention during AC power loss. IC Role / Device Role / Timing Role: MAX692AC/D monitors VCC, switches VOUT to VBATT at 4.40V, and holds RESET low until stable recovery. Use Value: Prevents data corruption during brownout by guaranteeing 200ms reset hold and sub-1µA backup current. |
Use Scenario: Industrial PLCs demand fail-safe reset behavior when main 5V supply dips due to load transients. IC Role / Device Role / Timing Role: MAX692AC/D asserts RESET within 2µs of VCC crossing 4.40V and sustains it for 200ms. Use Value: Meets IEC 61000-4-11 immunity requirements for short-duration voltage dips without software intervention. |
| Intelligent Instruments | Embedded System Watchdog Enforcement |
Use Scenario: Handheld multimeters use CMOS RAM to store calibration coefficients and user settings. IC Role / Device Role / Timing Role: MAX692AC/D supplies clean VOUT from VBATT during battery swap and asserts RESET on power-up. Use Value: Enables hot-swap battery replacement without triggering spurious reset or losing calibration data. |
Use Scenario: Medical infusion pumps run safety-critical firmware requiring guaranteed watchdog supervision. IC Role / Device Role / Timing Role: MAX692AC/D monitors WDI toggling; triggers hard RESET if firmware hangs for >1.6s. Use Value: Provides hardware-enforced recovery independent of μP clock or software state, meeting ISO 13485 reliability mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA | Same core functionality, 8-pin SOIC package with lead-free option; identical electrical specs and pinout | Ready-to-mount solution for PCB assembly; eliminates die bonding and packaging complexity | Select MAX692AESA for standard SMT production; MAX692AC/D only where hybrid integration or custom thermal/mechanical constraints apply |
| MAX802MCSA | Identical 4.40V reset threshold and 1.6s watchdog, but ±2% PFI accuracy specified only at +25°C (not over full temp range) | Suitable for commercial-temperature applications where full industrial temp-range PFI accuracy is not required | Choose MAX802MCSA for cost-sensitive consumer designs; MAX692AC/D preferred for industrial/automotive where guaranteed ±2% over -40°C to +85°C matters |
Compared with MAX692AESA and MAX802MCSA, the MAX692AC/D offers identical supervisory functionality in dice form - enabling ultra-compact hybrid modules - while retaining full industrial-grade PFI accuracy and guaranteed VCC = 1V RESET assertion, making it optimal for space-constrained, high-reliability embedded systems.
Availability
MAX692AC/D is available at Aetrix Electronics and suitable for battery-powered controllers, critical μP power monitoring, intelligent instruments, embedded system watchdog enforcement, and industrial data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX692AC/D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX692AC/D belongs to Maxim's microprocessor supervisory circuit family, engineered specifically to replace discrete reset generators and battery switchover circuits in space- and power-constrained embedded systems.
FAQ
What is the exact reset voltage threshold for MAX692AC/D?
The MAX692AC/D has a nominal reset threshold of 4.40V, with guaranteed limits of 4.25V (min) and 4.50V (max) over the full operating temperature range. This value is factory-trimmed and applies specifically to the MAX692A variant; it differs from the 4.65V threshold of the MAX690A/MAX802L series. The MAX692AC/D datasheet confirms this specification under Electrical Characteristics, Table "Reset Threshold".
Does MAX692AC/D support active-high reset output?
No, the MAX692AC/D provides only an active-low RESET output. The active-high RESET output (inverted logic) is exclusive to the MAX805L variant. The MAX692AC/D datasheet explicitly states that its RESET pin is active-low and does not include the complementary active-high output found on MAX805L. For active-high reset requirements, MAX805L or MAX692A with external inverter would be necessary.
Can MAX692AC/D operate with VCC below 4.40V and still assert RESET?
Yes - the MAX692AC/D guarantees RESET assertion down to VCC = 1V, meaning it continues to drive a valid logic-low RESET signal even as VCC collapses from 4.40V down to 1V. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where RESET output voltage is specified at VCC = 1.2V (for AE/M grades) and VCC = 1.0V (for AC/C grades). This ensures μP reset integrity during deep brownout.
What is the maximum allowable VBATT voltage for MAX692AC/D?
The maximum allowable VBATT voltage for MAX692AC/D is 4.55V, as specified in Table 2 ("Allowable Backup-Battery Voltages") of the datasheet. Exceeding this voltage risks forward-biasing the internal substrate diode (D1 in Figure 3) when VCC is near the reset threshold, potentially causing unintended current flow and reliability issues. Lithium cells (3.0–3.6V) and properly regulated supercaps are safe within this limit.
Is MAX692AC/D pin-compatible with other members of the MAX69x family?
Yes - the MAX692AC/D shares identical pinout and function mapping with the MAX692A, MAX692AESA, and MAX692AEPA packages. Pin 1 is VOUT, Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is WDI, Pin 7 is RESET, and Pin 8 is VBATT. This pin compatibility is explicitly stated in the datasheet's "Pin Configurations" and "Ordering Information" sections, confirming direct functional equivalence across package variants.
MAX692AC/D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX692AC/D FAQ
1.How can I place an order for MAX692AC/D through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692AC/D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX692AC/D reliable?
The price and inventory of MAX692AC/D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692AC/D is usually 5 days.
3.What payment methods are accepted for MAX692AC/D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692AC/D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692AC/D?
MAX692AC/D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692AC/D order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX692AC/D?
For technical support, including MAX692AC/D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692AC/D requirements.
6.How does Aetrix verify that MAX692AC/D is sourced from the original manufacturer or authorized distributors?
All MAX692AC/D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX692AC/D meets industry standards.
7.What is the process for return or replacement of MAX692AC/D?
All MAX692AC/D units undergo pre-shipment inspection (PSI). If there is an issue with MAX692AC/D, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX692AC/D part is unused and in its original packaging.
Return procedure for MAX692AC/D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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